Hi - looking for some much needed advice & clarity on what may be happening with my setup.. any insight greatly appreciated
- Context : i have a Baxi combi boiler in a recently built home (both from 2020).
The home has underfloor heating throughout, on 2 floors.
My boiler is loosing pressure, from 1.2 bar to 0.7 bar in half a day.
I have recently realised that the auto fill loop was left on the whole time (as in months, potentially years) by the initial installer (who now no longer exist, so its up to me to figure it out) ; as when the engineer came for boiler maintenance and closed the auto fill, the next day it was showing low pressure.
- There is no obvious sign of leak, or damp or else, anywhere in the house (2 floors), neither floor, walls, ceiling.. and i have bought a thermal imaging Flir module too (not as good as the 4 digit ones), and i cant see anything looking out of the ordinary on the UFH (apart from maybe 1 zone that heats up slower, and under the carpeted bedrooms, because i cant see the "details" of the pipework there, just whole heated zone. But overall, if there was a leak there for several months, potentially years, i guess it should at the very least show.
Test : When i shut down the UFH on both floors (the red and blue ball valves, at manifold level, for each), half a day later, the pressure has dropped the same on the boiler. Same when i shut down 1 system only instead of the 2
---> Question 1 : so does it mean that i can rule out that there is a leak under my floors (from the points of the manifolds, to everything going under my floors, ie. the tubes/loops) ?
--> Question 2 : Could my combi boiler be at fault, rather than the pressure drop being due to a leak ?
(at maintenance time, they found the expansion vessel and the secondary exchnager to be faulty and it was changed, under boiler cover i had active...but they did not test any other component for pressure drop, because at that time i did not know there was one, its only after that i found out).
What elements should i tell the engineer to test out / or replace, on the boiler, that could cause a pressure drop ?
(He is coming in a few days, and i just want to make sure he doesnt push the fault to there being a leak, if there is a possibility the issue is at boiler level)
--> Question 3 : if its not the underfloor heating "loops" in the floors (as per point 1), and not the boiler (point 2), then the only option is that it could be the central heating pipes running from the boiler to the manifold 1, and manifold 2, correct ?
(But i can see 90% of the path on these rather clearly with thermal imaging, and the lines look very neat)
---> Question 4 : Any other idea ?
Thank you very much !
- Context : i have a Baxi combi boiler in a recently built home (both from 2020).
The home has underfloor heating throughout, on 2 floors.
My boiler is loosing pressure, from 1.2 bar to 0.7 bar in half a day.
I have recently realised that the auto fill loop was left on the whole time (as in months, potentially years) by the initial installer (who now no longer exist, so its up to me to figure it out) ; as when the engineer came for boiler maintenance and closed the auto fill, the next day it was showing low pressure.
- There is no obvious sign of leak, or damp or else, anywhere in the house (2 floors), neither floor, walls, ceiling.. and i have bought a thermal imaging Flir module too (not as good as the 4 digit ones), and i cant see anything looking out of the ordinary on the UFH (apart from maybe 1 zone that heats up slower, and under the carpeted bedrooms, because i cant see the "details" of the pipework there, just whole heated zone. But overall, if there was a leak there for several months, potentially years, i guess it should at the very least show.
Test : When i shut down the UFH on both floors (the red and blue ball valves, at manifold level, for each), half a day later, the pressure has dropped the same on the boiler. Same when i shut down 1 system only instead of the 2
---> Question 1 : so does it mean that i can rule out that there is a leak under my floors (from the points of the manifolds, to everything going under my floors, ie. the tubes/loops) ?
--> Question 2 : Could my combi boiler be at fault, rather than the pressure drop being due to a leak ?
(at maintenance time, they found the expansion vessel and the secondary exchnager to be faulty and it was changed, under boiler cover i had active...but they did not test any other component for pressure drop, because at that time i did not know there was one, its only after that i found out).
What elements should i tell the engineer to test out / or replace, on the boiler, that could cause a pressure drop ?
(He is coming in a few days, and i just want to make sure he doesnt push the fault to there being a leak, if there is a possibility the issue is at boiler level)
--> Question 3 : if its not the underfloor heating "loops" in the floors (as per point 1), and not the boiler (point 2), then the only option is that it could be the central heating pipes running from the boiler to the manifold 1, and manifold 2, correct ?
(But i can see 90% of the path on these rather clearly with thermal imaging, and the lines look very neat)
---> Question 4 : Any other idea ?
Thank you very much !
